Phase to amplitude coupling as a potential biomarker for creative ideation: an EEG study

Area of Science:

• Neuroscience
• Cognitive Science
• Psychology

Background:

• The neuroscientific study of creativity consistently observes increased electroencephalography (EEG) alpha power during creative ideation.
• Existing research primarily uses event-related potential (ERP) paradigms, with limited analysis of dynamic EEG alpha power patterns during idea generation.

Purpose of the Study:

• To investigate time-unlocked changes in EEG alpha power patterns during creative idea generation.
• To identify potential neuroimaging biomarkers for creativity by analyzing brain network properties and phase-to-amplitude coupling (PAC).

Main Methods:

• Participants engaged in an Alternative Uses (AU) task for creative ideation and an Object Characteristics (OC) task as a control.
• EEG data were analyzed for relative power spectrum, global efficiency of brain networks (using imaginary coherence), and PAC.

Main Results:

• Relative power spectrum and nodal global efficiency did not show significant differences between the AU and OC tasks.
• Phase-to-amplitude coupling (PAC) revealed statistically significant differences between creative ideation (AU) and the control task (OC), specifically in the theta-gamma and alpha2-gamma frequency pairs.

Conclusions:

• PAC in specific frequency bands (θ-γ and α2-γ) shows promise as a sensitive biomarker for detecting creative ideation.
• These findings provide a foundation for developing connectomic biomarkers for creativity.